The 1 reference context in paper Christopher F. Baum, Tairi Room () “A test for long-range dependence in a time series” / RePEc:tsj:stbull:y:2001:v:10:i:60:sts18

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    If we can make a guess at these two factors, that is, intraclass correlation and cluster size, we can adjust our sample size calculations by multiplying the variance of the sample size formulas by the following correction
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    (Kish 1965)
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    +-(m-1) wherem=average number of observations per cluster,-=intraclass correlation If there is no intraclass correlation, that is,-=0, this correction factor reduces to 1, thus causing no increase in the sample size estimate.
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